M E N U « Home | Browse Minerals | QuizzesMinerals by letter: All | K | G | O | A | H | T | P | C | Q | N | Z | S | E | W | M | B | F | D | L Minerals by class: Silicates | Halides | Carbonates | Sulfates | Oxides | Phosphates | Hydroxides | Native elements | Sulfides Silicate Subclasses: Nesosilicates | Pyroxenes | Amphiboles | Frameworks | Sorosilicates | Cyclosilicates | Phyllosilicates    « Back to mineral listing A L A B A S T E R Click for expanded view Alabaster  (Gypsum)CaSO4 - 2H2O Class: Sulfate Hardness: 2 Density: 2.3 Streak: White Lustre: Vitreous Habit: Granular / massive form of gypsum Colours: Colourless or white (typical)    Crystal System: Monoclinic Cleavage: Perfect Fracture: Splintery Magnetism: None Reaction with HCl: Weak Identification in hand sample: Identified by hardness and good cleavage. Associations: Common in marine evaporite deposits. Industrial / ecomonic uses: Modern use is in gypsum wallboard used in construction. Used as an ornamental stone and for sculpture due to its softness. Comments: Also known as "satin spar".    Inaccurate data? Better photos? .

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